As you and the honourable member for Midhurst have already alluded to, mini loaders are great but people can’t see beyond more common machines. Subbing with mine has been a flop so far.
The best money spinners in many respects are doing simple things for the crass/lazy/stupid. Misfuel rescues, hot tub lifts etc. I draw the line at wheelie bin washing but you get the idea. Something I just thought of was puncture rescues for the increasing number of cars that don’t carry spares. Have a little car trailer with twenty common hole pattern wheels, a jack, a rattle gun and a roll of package wrap. Turn up to someone stranded, change a wheel, wrap their one up and put it in their back seat and charge them £100 for a £10 wheel. For extra points, buy the wheel back off them when they list it on marketplace a fortnight later. Does require turning out whenever and dealing with whoever though.
Back on machine machines, stump grinder or mower?